Radio, TV, CD Player and sound system have

  • loudspeakers
  • microphones
  • antennas
  • cathode tubes

A part of an electric circuit which is used to limit the amount of electric current flowing through the circuit is known as

  • diode
  • thermistor
  • radiator
  • resistor

The slowing down of electrons depends upon

  • material
  • mass of conductor
  • volume of conductor
  • length of conductor

When water is electrolyzed, the gas collected at cathode, is

  • sulphur
  • oxygen
  • hydrogen
  • sulphur dioxide

For protection of electrical appliances

  • resistors can be used
  • fuses can be used
  • thick wires can be used
  • thin wires can be used

If two cells are connected in series, the voltage will be

  • halved
  • doubled
  • tripled
  • quartered

The resistor that contains a long coil of 'nichrome' is known as

  • variable resistor
  • thermistor
  • transistor
  • fixed resistor

'Voltage' is measured by

  • ohms (Omega)
  • ampere (A)
  • watts (W)
  • volts (V)

Every time a fuse melts, you have to

  • change the wire
  • change the fuse
  • replace the plug
  • replace the circuit breaker

Never run a wire under

  • floor
  • pool
  • carpet
  • sofa

Inserting any part of human body to the socket can cause him

  • illness
  • a nasty shock
  • paralysis
  • unconsciousness

The heating element of electric appliances like iron, hair driers, kettles and toasters use

  • thick copper wire
  • thick nichrome wire
  • thin copper wire
  • thin nichrome wire

The best fit fuse for the hair drier that requires '2A' current is

  • 5A
  • 4A
  • 3A
  • 2A

A source that makes electrons to move is known as

  • battery
  • dam
  • turbine
  • dynamo

The process in which a bell keeps on repeating until the bell press is

  • pushed
  • pulled
  • released
  • hooked

Most electric bulbs have a coil of thin tungsten wire known as

  • coil
  • filament
  • spring
  • terminal

Voltmeter is always connected in

  • parallel
  • series
  • both a and b
  • pulleys

Due to change in the form of energy, the conductor gets

  • more resistance
  • less resistance
  • cold
  • hot

Before attempting any repair or adjusting an appliance, the power should be turned off, from

  • mains supply
  • circuit breaker
  • socket switch
  • appliance switch

The metal with the highest resistance is

  • silver
  • aluminum
  • sodium
  • tungsten

'ELCB'is an

  • electronic switch
  • electromagnetic switch
  • electric appliance
  • electric bulb

Power is measured in

  • Joules (J)
  • Pascal's (Pa)
  • Watts (W)
  • Ohms (Omega)

The wire coil acts as an

  • electric wire
  • electric plate
  • electromagnet
  • conductor

The loudspeaker changes the electric signals into

  • light waves and heat
  • heat and sound waves
  • sound waves
  • heat energy

Earth wire is a wire that

  • is used to earth excess current
  • insulates excess current
  • diffuses excess current
  • recharges voltage

The wire coil is wound round the neck of a

  • paper cone
  • magnet
  • bass tube
  • mechanical magnet

Maglev trains don't

  • ride on the track
  • fall from the track
  • repel from the track
  • stay on the track

The negative and positive regions of a battery are known as

  • ridges
  • chargers
  • terminals
  • electrodes

When bulbs are arranged in series, the bulbs would glow

  • brighter
  • dimmer
  • sharper
  • none of above

To overcome the resistance

  • power has to be used
  • force has to be used
  • more current has to be used
  • energy has to be used
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